1.)CaCO3→CO2+CaO A scientist heats 30 grams of calcium carbonate (CaCO3) in the chemical reaction shown. What is the total mass of the products? (1 mark)
A.) 10 grams
B.)15 grams
c.)60 grams <<<
D.)30 grams
2.)Fe+O2→Fe2O3
What happens to Fe and O2 atoms during the reaction? (1 mark)
A.) They are lost.
B.) They are rearranged.<<<
C.) They retain their properties.
D.) They gain in mass.
3.) What is most likely to happen in a chemical reaction? (1 mark)
A.) New atoms are created.
B.)Mass is conserved.<<<
C.) The original substance retains its properties.
D.) Molecules of the original substance are lost.
{4.}NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown. Which statement about reaction is correct? (1 mark)
A.) Na atoms are destroyed during the reaction.
B.) Some atoms gain mass after the reaction.
C.) There are more H atoms after the reaction.
D.) The atoms of the reactants are grouped together during the reaction.<<< {5.}2H2+O2→2H2O
There are four hydrogen atoms (H) before the reaction. How many hydrogen atoms are present after the reaction?
(1 mark)
AT 8
B.)2
C.)5
D.)4<<<< The answers to the chemical reactions quiz are:
1. 30 grams
2. They are rearranged
3. Mass is conserved
4. The Atoms of the reactants are grouped together during the reaction
5.4
Hope I could help 🙂 Karen chill, all we do is
1. verification
Where
2.borrow answers
KAREN!!! trust me its correct make sure you read the answer they could be wrong 1.30 grams
2. They are rearranged
3. Mass is conserved
4. The Atoms of the reactants are grouped together during the reaction
5.4
If y’all need me, always say #Lost and spread love not hate!
LoL karen needs to relax Believe me this girl is right and I am not cheating, if you are not cheating then why are you here and how do you know this website. Also, we’re here because our answer needs to be checked or we need to borrow one if we got it wrong, so before you accuse us of cheating, make sure you have all the facts. Welcome 😉 @Trustme is right
Thank you Thx Trustme!!! believe me it’s ok, trust them you will get 100 Trustme, it’s true! anonymous is right but 1 is 30 grams not 60 cheating? Me? besties everrrrr. But just because – @lost and @trust or correct 😏 As I can see here you say it’s ‘C, A, D, B, D’ based on new rearrangements. The lack of confidence I have now ✋🏽😭 I’m not cheating if you’re not cheating why are you here😎 1.30 grams
2.they are rearranged
3. mass is conserved
4. The atoms of the reactants are brought together during the reaction.
5.4
don’t listen to Anonymous, I did and got a 3/5 on my test. last question is 4 not 2 but im not very smart and anonyms are right otherwise @Trust Me is correct <333 Anonymous your rong on 1 is 30 Thanks! Thanks DrBob 100% I'll get more later]Dr.Bob shut up man number 1 was rong i was 30 Cheating is cool 😎😎😎 90% of people get married there 7th grade love . since you have read this, we will announce good news to you this evening. if you don't pass that on nine comments your worst week starts now, that's not wrong. Apparently, if you copy and paste this on ten comments in the next ten minutes, you will have the best day of your life tomorrow. you will either be kissed or asked for in the next 53 minutes, someone will say i love you Anonymous
November 3, 2021
Naaaaaaaaaaaaaaaaaa Anonymous Bro is correct except 1 is 30 grams believe me is correct!! merciuu <33 Believe me it's true thank you man / woman believe me it's true thank you! um yes thanks but number one is wrong the answer is 30 not 60 @TrustMe GI Joe approves of your post trust me tyyy thanks trust me trust me is 100% correct @trust me is 100% correct ty #lost I love you somewhat helpful! Here are the correct answers 1 is c 2 is c not a 3 is c not d 4 is also c not b 5 is a
D
B
D
VS
A @trustme is right! Thank you very much, @trustme, you are 100% right 😀 @Trust Me 🙂 I’m checking the answers now…
100% thank you 😉
@I don’t cheat
“Stop Cheating”
Brother, how did you end up here?!?!
Also, some just check, so get your facts checked. 😛
Some people are smarter than you, so deal with them.
# NO MORE BLASPHEM!!!!! I have an apple I have a pen Trust me, I’m right 🙂 Chemical changes affect the chemical structure of a substance. wasd Trust me is 100% correct.
be sure to read the answers carefully.
I just took the quiz and got 5/5. istg bro it’s too much for me brain yoinks people don’t like being told to stop cheating when it’s gonna affect your life even if it’s not right now and don’t get me started on the fact that some of us use it to verify our awnsers you don’t just cheat, have fun working at McDonald’s @anyomous hah and you think you’re smart? hiii believe me thats ok and who ever called us cheaters, i have a question since you posted your comment recently why were you on this site unless you also cheat?? ………………………. …………… and thank you Anonymous is right I got a 100%😁😁✔️✔️✔️✔️ Thank you Ty!! I came to check my answers, and I might have gotten 2/5 if it hadn’t been for @Trust Me 🙂
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vs
b
a
a
an oops. I made a typo. If you start with 30 grams of CaCO3, you should end up with 30 grams of product. Now I see your reasoning. You think 30 grams of CaCO3 will give you 30g of CO2 and 30g of CaO to make a total of 60 grams, but it doesn’t work that way. You can see from my calculations how much CO2 and how much CaO is produced. The main thing is the law of conservation of mass. Sorry for the typo. My sight is not so good. Add more what?
CaCO3 ==> CaO + CO2
We can calculate the grams of CaO and the grams of CO2 produced from 30g of CaCO3, which I will do, but that’s not necessary if you remember that the law of conservation of mass says that matter n is neither created nor destroyed. So if you start with 20 grams of CaCO3, you should end up with a total of 30 grams on the other side. mass CO2 + mass CaO = 30 g. But we can prove it’s correct by calculating the mass of each and adding them together.
mol CaO = grams/molar mass = 30/100 = 0.3 mol CaCO3
We get 0.3 mol of CO2 and 0.3 mol of CaO.
grams CO2 = mol x molar mass = 0.3 x 44 = 13.2 g
grams CaO = mol x molar mass = 0.3 x 56 = 16.8 g
gCaO + gCO2 = 16.8 + 13.2 = 30.0
So ! 1. No. You start with 30 g of CaCO3. You cannot get more products in total than you started.
2. Ok
3. Okay. But why didn’t you use it in answer 1.
4. Ok
5. OK STOP CHEATING